Diquarks not found

Pythia likes to make diquark intermediate particles sometimes, and they are listed in the numbering scheme e.g. (ud)_0 2101 but cannot be constructed:

>>> from particle import Particle
>>> Particle.from_pdgid(2101)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/ncsmith/Library/Python/3.7/lib/python/site-packages/particle/particle/particle.py", line 756, in from_pdgid
    raise ParticleNotFound("Could not find PDGID {0}".format(value))
particle.particle.particle.ParticleNotFound: Could not find PDGID 2101

[eduardo-rodrigues]

I’m finally back to work on the package since I started my new job! Apologies for the terribly long delay.

PR https://github.com/scikit-hep/particle/pull/224 adds info on diquarks. Soon I will add info for other non-standard particles, which is not available through the downloadable PDG .mcd file.

I even added a bit more info on diquarks, so not just the name:

In [2]: print(Particle.from_pdgid(2101).describe())
Name: (ud)(0)        ID: 2101         Latex: $(ud)_{0}$
Mass  = ?
Width = ?
Q (charge)        = +1/3    J (total angular) = 0.0      P (space parity) = ?
C (charge parity) = ?       I (isospin)       = 1.0      G (G-parity)     = ?
    Antiparticle name: (ud)(0)~ (antiparticle status: Barred)

[nsmith-]

Hi, sorry for mass indeed all I would expect is None. For those I just want the name. (which the rebuttal might be" you can deduce by inspecting the number carefully but ok)